GB855502A - Production of silica hydro-organosols and aerogels - Google Patents
Production of silica hydro-organosols and aerogelsInfo
- Publication number
- GB855502A GB855502A GB5223/58A GB522358A GB855502A GB 855502 A GB855502 A GB 855502A GB 5223/58 A GB5223/58 A GB 5223/58A GB 522358 A GB522358 A GB 522358A GB 855502 A GB855502 A GB 855502A
- Authority
- GB
- United Kingdom
- Prior art keywords
- exchange material
- anion
- hydro
- organosol
- cation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
- C01B33/145—Preparation of hydroorganosols, organosols or dispersions in an organic medium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
- C01B33/157—After-treatment of gels
- C01B33/158—Purification; Drying; Dehydrating
- C01B33/1585—Dehydration into aerogels
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
A process for preparing an acidic, silica hydro-organosol of extremely low salt-content comprises contacting an acidic hydro-organosol containing silica, water, a water-miscible organic liquid, mineral acid in an amount to give a pH between 1.8 and 4.5 and at least 0.1% by weight of a salt of such mineral acid with the hydrogen-form of a water-insoluble, strong, cation-exchange material and with the sulphate-form of a water-insoluble, anion-exchange material containing salt-forming nitrogen atoms, either simultaneously or successively, and at a temperature below 30 DEG C. until the hydro-organosol contains less than 0.01% by weight of said salt, contact with the anion-exchange material ceasing before pH exceeds 4.5. If the hydro-organosol is first contacted with the strong cation-exchange material and then with the sulphate form of the anion-exchange material, the initial sol has a pH of 3-4.5 and is maintained in contact with the cation-exchange material until the pH is between 1.8 and 2.5 and then is contacted with an anion-exchange material until the pH is between 3 and 4. If the sol is first treated with an anion-exchange material the hydro-organosol has a pH between 1.8 and 3.5 and the pH is not allowed to exceed 4.5. The sol is then contacted with a cation-exchange material until the pH is between 1.8 and 3.3 The resulting sol may be further treated with an anion-exchange material until the pH is between 3.5 and 4.5 and may be further treated with each kind of ion-exchange resin. If the hydro-organosol is simultaneously contacted with a mixture of the anion-exchange and cation-exchange material the initial sol generally has a pH of 2.5-4.5 and is maintained in contact with the mixture of resins at a pH between 2.5 and 4. A silica aerogel can be obtained by a process of U.S.A. Specification 2,093,454. Specifications 649,896, 654,850, and U.S.A. Specifications 2,341,907, 2,366,007, 2,366,008, 2,591,573, 2,591,574 and 2,614,099 also are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US855502XA | 1957-02-16 | 1957-02-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB855502A true GB855502A (en) | 1960-11-30 |
Family
ID=22192362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5223/58A Expired GB855502A (en) | 1957-02-16 | 1958-02-18 | Production of silica hydro-organosols and aerogels |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB855502A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0366197A1 (en) * | 1988-10-27 | 1990-05-02 | Koninklijke Philips Electronics N.V. | Method of manufacturing a monolithic silica aerogel |
| EP0864531A1 (en) * | 1997-03-05 | 1998-09-16 | Armstrong World Industries, Inc. | Wet silica gels for aerogel and xerogel thermal insulation and processes for the wet gels |
-
1958
- 1958-02-18 GB GB5223/58A patent/GB855502A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0366197A1 (en) * | 1988-10-27 | 1990-05-02 | Koninklijke Philips Electronics N.V. | Method of manufacturing a monolithic silica aerogel |
| EP0864531A1 (en) * | 1997-03-05 | 1998-09-16 | Armstrong World Industries, Inc. | Wet silica gels for aerogel and xerogel thermal insulation and processes for the wet gels |
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